/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.flink;

import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.plugin.task.api.TaskConstants;
import org.apache.dolphinscheduler.plugin.task.api.TaskException;
import org.apache.dolphinscheduler.plugin.task.api.TaskExecutionContext;
import org.apache.dolphinscheduler.plugin.task.api.model.ResourceInfo;
import org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParameterUtils;
import org.apache.dolphinscheduler.plugin.task.api.stream.StreamTask;

import org.apache.commons.collections4.CollectionUtils;

import java.io.IOException;
import java.util.List;

public class FlinkStreamTask extends FlinkTask implements StreamTask {

  /**
   * flink parameters
   */
  private FlinkStreamParameters flinkParameters;

  /**
   * taskExecutionContext
   */
  private TaskExecutionContext taskExecutionContext;

  public FlinkStreamTask(TaskExecutionContext taskExecutionContext) {
    super(taskExecutionContext);
    this.taskExecutionContext = taskExecutionContext;
  }

  @Override
  public void init() {
    logger.info("flink task params {}", taskExecutionContext.getTaskParams());

    flinkParameters = JSONUtils.parseObject(taskExecutionContext.getTaskParams(), FlinkStreamParameters.class);

    if (flinkParameters == null || !flinkParameters.checkParameters()) {
      throw new RuntimeException("flink task params is not valid");
    }
    flinkParameters.setQueue(taskExecutionContext.getQueue());
    setMainJarName();

    FileUtils.generateScriptFile(taskExecutionContext, flinkParameters);
  }

  /**
   * create command
   *
   * @return command
   */
  @Override
  protected String buildCommand() {
    // flink run/run-application [OPTIONS] <jar-file> <arguments>
    List<String> args = FlinkArgsUtils.buildRunCommandLine(taskExecutionContext, flinkParameters);

    String command = ParameterUtils
        .convertParameterPlaceholders(String.join(" ", args), taskExecutionContext.getDefinedParams());

    logger.info("flink task command : {}", command);
    return command;
  }

  @Override
  protected void setMainJarName() {
    if (flinkParameters.getProgramType() == ProgramType.SQL) {
      logger.info("The current flink stream job type is SQL, will no need to set main jar");
      return;
    }
    ResourceInfo mainJar = flinkParameters.getMainJar();
    String resourceName = getResourceNameOfMainJar(mainJar);
    mainJar.setRes(resourceName);
    flinkParameters.setMainJar(mainJar);
  }

  @Override
  public AbstractParameters getParameters() {
    return flinkParameters;
  }

  @Override
  public void cancelApplication() throws TaskException {
    List<String> appIds = getApplicationIds();
    if (CollectionUtils.isEmpty(appIds)) {
      logger.error("can not get appId, taskInstanceId:{}", taskExecutionContext.getTaskInstanceId());
      return;
    }
    taskExecutionContext.setAppIds(String.join(TaskConstants.COMMA, appIds));
    List<String> args = FlinkArgsUtils.buildCancelCommandLine(taskExecutionContext);

    logger.info("cancel application args:{}", args);

    ProcessBuilder processBuilder = new ProcessBuilder();
    processBuilder.command(args);
    try {
      processBuilder.start();
    } catch (IOException e) {
      throw new TaskException("cancel application error", e);
    }
  }

  @Override
  public void savePoint() throws Exception {
    List<String> appIds = getApplicationIds();
    if (CollectionUtils.isEmpty(appIds)) {
      logger.warn("can not get appId, taskInstanceId:{}", taskExecutionContext.getTaskInstanceId());
      return;
    }

    taskExecutionContext.setAppIds(String.join(TaskConstants.COMMA, appIds));
    List<String> args = FlinkArgsUtils.buildSavePointCommandLine(taskExecutionContext);
    logger.info("savepoint args:{}", args);

    ProcessBuilder processBuilder = new ProcessBuilder();
    processBuilder.command(args);
    processBuilder.start();
  }
}
